my opinion of the situation is that Zimmerman (who seems like a wanna be cop, rent a cop) was probably dying for a situation like this to come up, saw his opportunity and made it happen. all he had to do was notify the police, and when he did they told him not to follow but he did anyway. Zimmerman escalated the situation on purpose, generated a conflict, and shot him, using self defense as an excuse
sad thing is i don't think he will be found guilty of any wrong doing according to the law
i realize this is my opinion and i don't know what really happened, but based on the evidence presented, and based on Zimmerman's character, that's my feeling